Name: Creamy Keto Tuna Casserole Your New Favorite Dinner Delight
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Ingredients: 2 tablespoons Olive oil (Substitute with avocado oil if preferred.); 2 tablespoons Butter (Can be replaced with a dairy-free alternative, such as vegan butter.); 4 cups Green cabbage (Shredded, low-carb alternative to noodles.); 1 cup Chopped onion (Green onions or shallots can be used as a milder substitute.); 1 cup Celery (Chopped, can omit if not available.); 3 cloves Garlic (Minced, fresh is preferred.); 1 teaspoon Sea salt (Adjust to taste.); 1 teaspoon Black pepper (Adjust to taste.); 1 tablespoon Dried dill (Fresh herbs can enhance flavor.); 1 teaspoon Dry mustard powder (Dijon mustard can serve as a substitute.); 1 tablespoon Lemon zest (Lime zest can be used for different flavor.); 2 tablespoons Lemon juice (Ensure it's freshly squeezed.); 1 cup Heavy cream (Coconut cream can be used for dairy-free version.); 1 cup Grated Parmesan cheese (Nutritional yeast can replace for dairy-free.); 2 cans Albacore tuna (Drained, high protein.); 1 cup Frozen peas (Fresh peas can also be added.)

There I was, flipping through a cherished cookbook from my childhood, and the memories of creamy casseroles flooded my mind. I knew I had to recreate that comfort food nostalgia while sticking to my keto lifestyle. Enter the Creamy Keto Tuna Casserole, a dish that embraces the heartiness of traditional recipes but swaps out high-carb ingredients for nutritious, low-carb choices. This delightful casserole not only satisfies those comfort cravings but also offers a quick prep time—just 15 minutes! Picture this: a velvety sauce embracing sautéed cabbage, zesty lemon, and savory tuna, all bursting with flavor yet guilt-free. Plus, it’s customizable, so you can tweak it to suit your preferences or dietary needs. Are you ready to dive into the warm embrace of this modern twist on a classic dish? Let’s get cooking!

Why Is This Casserole a Must-Try?

Quick and Easy: With just 15 minutes of prep time, you’ll have this delicious, nourishing meal ready in no time.

Nutritious Ingredients: Substituting high-carb noodles with green cabbage keeps this dish low-carb while packing in vitamins and fiber.

Flavor Explosion: The zesty lemon and aromatic dill create a mouthwatering sauce that elevates the tuna to new heights.

Customizable: Whether you’re a fan of classic flavors or want to spice things up, this casserole can adapt to your taste. Consider adding smashburger quesadillas for a protein-packed twist!

Heartwarming Comfort: It brings the nostalgic feel of traditional casseroles, making it the perfect comfort food for any night of the week.

Crowd-Pleaser: Your family and friends will love it, and they may never guess it’s keto-friendly!

Creamy Keto Tuna Casserole Ingredients

For the Base

Olive oil – Provides heart-healthy fats for sautéing the veggies. Substitute with avocado oil if preferred.
Butter – Enhances richness and flavor of the sauce. Can be replaced with a dairy-free alternative, such as vegan butter.
Green cabbage – Shredded, low-carb alternative to noodles, adding crunch. Substituting with spinach or cauliflower rice can provide different textures.
Chopped onion – Adds savory depth. Green onions or shallots can be used as a milder substitute.
Celery – Chopped, for a refreshing bite and sweetness. Can omit if not available.
Garlic – Minced, for aromatic flavor. Garlic powder can be an alternative, though fresh is preferred.

For the Flavor

Sea salt and black pepper – Essential seasonings to elevate flavors. Adjust to taste.
Dried dill or fresh dill – Adds brightness. Fresh herbs can always enhance the flavor profile.
Dry mustard powder – Provides tanginess. Dijon mustard can serve as a substitute for a similar flavor.
Lemon zest – Offers a burst of brightness. Lime zest can be used for a different citrus flavor.
Lemon juice – Adds refreshing acidity, crucial for cutting through creaminess; ensure it’s freshly squeezed for the best flavor.

For the Creamy Sauce

Heavy cream – Serves as a rich base for the sauce. Coconut cream can be used for a dairy-free version.
Grated Parmesan cheese – Adds creaminess; mix into the sauce and sprinkle on top for a golden crust. Nutritional yeast can replace cheese for a dairy-free option.

For the Filling

Albacore tuna – Drained, high protein, and the star ingredient. Can swap for canned chicken or beans for a different protein source.
Frozen peas – Provides color and nutrients. Fresh peas can also be added for a different texture.

This Creamy Keto Tuna Casserole is not just a dish; it’s a delightful embrace of flavors and textures you can feel good about serving!

Step‑by‑Step Instructions for Creamy Keto Tuna Casserole Your New Favorite Dinner Delight

Step 1: Heat the Oils
In a large, extra-large ovenproof skillet, heat 2 tablespoons of olive oil and 2 tablespoons of butter over medium heat until shimmering. This should take about 1-2 minutes. You’ll know it’s ready when the butter is foamy but not browned; this is the perfect base for your sautéed veggies in this creamy keto tuna casserole.

Step 2: Sauté the Vegetables
Add 4 cups of shredded green cabbage, 1 chopped onion, and 1 cup of chopped celery to the skillet. Season with sea salt and black pepper to taste, then sauté for about 10 minutes. Stir frequently until the cabbage is crisp-tender and the onions are translucent. This colorful vegetable medley will enhance the flavors of your casserole beautifully.

Step 3: Incorporate Zesty Flavors
Mix in 1 tablespoon of dried dill, 1 teaspoon of dry mustard powder, the zest and juice of 1 lemon, and stir well to combine all flavors. Continue cooking for another 2-3 minutes, allowing the ingredients to meld together. The fresh aroma will elevate your creamy keto tuna casserole to the next level!

Step 4: Create the Creamy Sauce
Pour in 1 cup of heavy cream and stir in 1 cup of grated Parmesan cheese. Keep the heat at medium and stir until the cheese has melted completely and the sauce is creamy. This luscious combination will be the heart of your casserole, enveloping the veggies and tuna in comforting goodness.

Step 5: Simmer and Thicken
Reduce the heat to medium-low and allow the mixture to simmer gently for about 5 minutes or until slightly thickened. Stir occasionally and watch as the sauce becomes luxuriously velvety. This step is crucial for achieving the perfect consistency in your creamy keto tuna casserole.

Step 6: Combine with Tuna and Peas
Gently fold in 2 cans of drained albacore tuna and 1 cup of frozen peas, mixing until everything is evenly incorporated. Cook for an additional 2-3 minutes just until the peas are warmed through. This adds a burst of color and nutrition to your dish while keeping it rich and satisfying.

Step 7: Broil for a Golden Finish
Preheat your broiler while you sprinkle the remaining ¼ cup of grated Parmesan over the casserole. Broil for 3-5 minutes until the cheese is bubbling and golden brown. Keep a close eye on it to prevent burning. The crispy cheese crust will create a delightful contrast to the creamy filling of your casserole.

How to Store and Freeze Creamy Keto Tuna Casserole

Fridge: Store leftover creamy keto tuna casserole in an airtight container for up to 3 days. Reheat gently in the microwave or on the stovetop to enjoy it warm again.

Freezer: For longer storage, freeze the casserole in a suitable container for up to 2 months. Ensure it’s tightly sealed to prevent freezer burn.

Thawing: When you’re ready to enjoy your frozen casserole, thaw it overnight in the fridge for best results.

Reheating: Reheat your thawed casserole in a preheated oven at 350°F (175°C) until warmed through, about 20-25 minutes. Add a splash of cream if the sauce feels too thick.

Creamy Keto Tuna Casserole Variations

Feel free to explore these delightful twists and swaps for your casserole that will inspire your taste buds!

Dairy-Free: Substitute heavy cream with coconut cream and nutritional yeast for a cheesy flavor that everyone will love. This option lets you enjoy the creamy goodness without the dairy!
Low-FODMAP: Replace onion and garlic with the green tops of scallions to create a milder flavor profile. Perfect for those sensitive to FODMAPs while still keeping it delicious!
Add Vegetables: Boost nutrition by incorporating bell peppers, spinach, or zucchini. These colorful additions not only enhance flavors but also add vibrant textures to your casserole.
Spice it Up: Add crushed red pepper flakes or hot sauce for a delightful kick! It’s a simple way to transform the dish into a spicy fiesta.
Change Protein: Use cooked chicken, shrimp, or beans as alternatives to tuna for a different protein source. This versatility keeps meal times exciting every week!
Nutty Flavor: Mix in toasted pine nuts or slivered almonds for added texture and a nutty twist. These crunchy elements elevate the creamy experience beautifully.

Enhance your cooking adventures and try varying your ingredients in this creamy keto tuna casserole, just like in a classic chicken potato casserole! Or check out Buffalo chicken pasta for another fantastic dish to add to your repertoire!

Make Ahead Options

These Creamy Keto Tuna Casserole ingredients are perfect for meal prep! You can chop the vegetables (green cabbage, onion, and celery) and store them in an airtight container in the refrigerator for up to 3 days. The creamy sauce can be prepared ahead as well; simply mix the heavy cream, Parmesan cheese, and seasonings together and refrigerate for up to 24 hours. To prevent the cabbage from wilting, combine the casserole just before baking. When you’re ready to enjoy, fold in the tuna and peas, then proceed to broil until golden brown. You’ll have a delicious, nutritious dinner that’s just as satisfying with minimal last-minute effort!

What to Serve with Creamy Keto Tuna Casserole?

Nothing completes a comforting meal like a few thoughtful sides to elevate your dining experience.

Simple Green Salad: A fresh salad with a light vinaigrette adds a crisp contrast to the creamy casserole. The refreshing crunch balances the rich flavors perfectly.
Garlic Butter Green Beans: Tender green beans sautéed in garlic and butter offer a delightful bite that contrasts beautifully with the casserole’s smooth texture. Their vibrant green color is also visually appealing.
Low-Carb Bread Rolls: Soft, fluffy rolls make the ideal utensil for scooping up all the comforting goodness. Enjoy them warm with a bit of butter to enhance the taste experience.
Cauliflower Mash: Creamy mashed cauliflower is a delightful low-carb alternative to traditional potatoes, keeping the meal light yet satisfying. The velvety texture complements the casserole wonderfully.
Lemonade or Iced Tea: A refreshing glass of lemonade or iced tea adds a zesty, cooling element to your meal. The acidity cuts through the richness and keeps the palate refreshed.
Cheesecake Fluff: For dessert, opt for a light and airy cheesecake fluff made with cream cheese and whipped cream. It’s a lovely, no-bake treat that won’t interfere with your keto goals.

Each of these pairings brings something unique to the table, creating a delightful dining experience your friends and family will remember fondly.

Expert Tips for Creamy Keto Tuna Casserole

Prep Ahead: Organize your ingredients and chop vegetables in advance to make the cooking process smoother and faster.
Sauce Consistency: If the creamy sauce thickens too much, simply add a splash of cream or broth while stirring until you reach the desired texture.
Quality Tuna: Choose high-quality albacore tuna for the best flavor. Avoid cheaper brands as they can affect the overall taste of your creamy keto tuna casserole.
Customize Flavors: Feel free to adjust the amount of dill and lemon in your recipe! These elements can be tailored to your taste, enhancing your casserole experience.
Watch the Broil: Keep an eye on your casserole while it’s under the broiler to ensure the cheese crust becomes perfectly golden without burning.
Add Extra Veggies: Don’t hesitate to mix in more vegetables like zucchini or bell peppers to boost nutrition and flavor in your creamy keto tuna casserole.

Creamy Keto Tuna Casserole Recipe FAQs

What type of cabbage should I use for the casserole?
Absolutely! I recommend using green cabbage as it provides a crunchy texture and is a fantastic low-carb alternative to noodles. If you’re looking for a change, feel free to substitute it with spinach for a softer texture or cauliflower rice for a completely different base.

How long can I store leftovers in the fridge?
Leftover creamy keto tuna casserole can be stored in an airtight container in the fridge for up to 3 days. When you’re ready to enjoy it again, simply reheat it gently in the microwave or on the stovetop, adding a splash of cream if the sauce has thickened too much.

Can I freeze this casserole? How long does it last?
Yes! For longer storage, you can freeze the creamy keto tuna casserole for up to 2 months. Make sure it’s packed tightly in a suitable freezer-safe container to prevent freezer burn. When you’re ready to enjoy it, thaw it overnight in the fridge before reheating.

What do I do if the sauce is too thick?
No worries at all! If you find that the sauce has thickened too much while cooking, simply add a splash of cream or broth and stir until you achieve the desired consistency. It’s all about adjusting to your preference, so feel free to tweak until it’s just right!

Is this casserole safe for those with food allergies?
If you have dietary restrictions or allergies, it’s important to tailor the recipe to your needs. I recommend checking the labels on your ingredients, particularly the tuna and any substitutes. Opt for gluten-free options where necessary and ensure all elements are free from allergens suitable for your dietary requirements.

Can I customize the protein in this casserole?
Very much so! While albacore tuna is the star ingredient, you can swap it for canned chicken, shrimp, or even beans if you’re looking for a vegetarian option. Each will bring its unique flavor and texture while still keeping the dish hearty. The more, the merrier!